Fixed some Bootstrap 3 related issues

Please dont merge yet.

Ran into some issues when building jdf-site locally. All related to Bootstrap-sass usage. I had to remove references to "bootstrap-responsive" since it is not present in Bootstrap 3. Also removed reference to $gridGutterWidth which now seems to be replaced by $grid-gutter-width.

FYI: The build was using bootstrap-sass-3.0.0.0